Hi. I'm writing an Event class, and have the following code
(important line highlighted):
class Event(TEventArgs : EventArgs = EventArgs) {
alias void delegate(Object, TEventArgs) THandlerFn;
SList!(THandlerFn) handlers;
Event opOpAssign(string op)(void delegate() handler) {
static if (op == "+") {
handlers.insert( (Object o, EventArgs e) { handler();
} );
return this;
} else static assert(0, "Operator "~op~" not
implemented");
}
}
Usage:
Event!EventArgs Close;
Close += { ... some delegate code ... };
Calling the first (and only) delegate in the "handlers" list
fails to call my delegate code.
If I change the function to the following (changes highlighted):
Event opOpAssign(string op)(void delegate() handler) {
static if (op == "+") {
auto wrapper = (Object o, EventArgs e) { handler(); };
handlers.insert(wrapper);
return this;
} else static assert(0, "Operator "~op~" not implemented");
}
It works without any problem. Why is this?
(In case you're wondering, I'm wanting the ability to pass in a
delegate accepting no arguments, in place of a delegate accepting
an Object and an EventArgs.)